yorkcity, thisis "nightline" with cynthia mcfadden. >> good evening, and thanks for joining us. tonight, a four-day pleasure cruise turned hellish ordeal. 4,200 people are being towed back to shore tonight trapped aboard the carnival cruise ship that lost power in the gulf of mexico sunday. the passengers onboard describe nightmarish scenes of squalor. >> reporter: tonight, stranded at sea. as seen today from above, the carnival triumph being towed to port in mobile, alabama. it is day four of what has turned into the holiday from hell for the more than 4,000 people onboard. bethany is aboard, they spoke briefly before the phone cut out. >> all you hear on those phone calls is crying and talking about i'm gonna die, i'm gonna die. >> reporter: rob and stephanie had hoped for a beautiful wedding at sea. married on the ship just a few days ago. they are now spending their honeymoon in squalor. the sparkling city on the sea topped with pools, food, and boow? seen in better times in these carnival ads was far from the dream vacation when the ship went dark sunday as it sailed from